fix: remove deprecated --txlookuplimit flag from start-op-geth.sh

[amathxbt]

Bug

scripts/start-op-geth.sh passes both --txlookuplimit=0 and --history.transactions=0 to geth:

  --txlookuplimit=0 \        # ❌ deprecated since geth v1.13
  --history.state=0 \
  --history.transactions=0 \ # ✅ the replacement flag

--txlookuplimit was deprecated and then removed in go-ethereum v1.13+ in favour of --history.transactions. Passing the removed flag causes:

• Startup failure on geth builds ≥ v1.13 that have fully removed the flag (flag provided but not defined: -txlookuplimit)
• Confusing warnings on builds that still accept it but treat it as a no-op
• Operator confusion when reading the config, since the intent (disable tx index limit) is expressed twice with inconsistent naming

Fix

Remove the deprecated --txlookuplimit=0 line. The desired behaviour (no transaction lookup limit) is already correctly expressed by the --history.transactions=0 flag that remains.

Reference

• go-ethereum PR #28659 — removal of --txlookuplimit
• go-ethereum changelog v1.13.0